If it’s acceptable for humans to exploit other animals for food, clothing, labor, entertainment or experiments because we’re more intelligent than them, would it be equally acceptable for a superintelligent alien race with 10x the mental capacity as humans to do the same to us?
I really doubt they were slaughtered near the end of their lives, that wouldn’t be profitable for the farm, cows live 20+ years for example.
And even if there were, it’s still killing someone for profit, that’s cruel.